Bug Description

The get_codeforces_submission_stats method and get_leetcode_data make external API calls with no timeout and no error handling, causing the entire endpoint to crash on network failures.

Affected Code

# views.py, line 259 - NO TIMEOUT
url = f"https://codeforces.com/api/user.status?handle={username}"
response = requests.get(url)  # Will hang forever if server doesn't respond

# views.py, line 463-464 - NO TIMEOUT, NO ERROR HANDLING
url = f"https://alfa-leetcode-api.onrender.com/userProfile/{username}"
response = requests.get(url)

if response.status_code == 200:
    data = response.json()  # If not 200, returns None implicitly

Impact

• If Codeforces API hangs, the page never loads (no timeout set)
• If LeetCode API returns 500/503, get_leetcode_data() returns None, causing KeyError when the caller does user_data["ranking"]
• The onrender.com LeetCode proxy is on a free tier and frequently sleeps

Expected Behavior

• All requests.get() calls should use timeout=30 to prevent hanging
• The LeetCode endpoint should check if user_data is None before returning